101
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Affiliation(s)
- Jennifer Wilent
- Department of Chemistry and
Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States
| | - Kimberly S. Petersen
- Department of Chemistry and
Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States
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102
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Miyamae N, Watanabe N, Moritaka M, Nakano K, Ichikawa Y, Kotsuki H. Asymmetric organocatalytic desymmetrization of 4,4-disubstituted cyclohexadienones at high pressure: a new powerful strategy for the synthesis of highly congested chiral cyclohexenones. Org Biomol Chem 2014; 12:5847-55. [DOI: 10.1039/c4ob00733f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A highly diastereoselective and enantioselective method for the asymmetric desymmetrization of 4,4-disubstituted cyclohexadienones at high pressure was developed.
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Affiliation(s)
- Naomu Miyamae
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
| | - Naruhisa Watanabe
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
| | - Maya Moritaka
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
| | - Keiji Nakano
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
| | - Yoshiyasu Ichikawa
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
| | - Hiyoshizo Kotsuki
- Laboratory of Natural Products Chemistry
- Faculty of Science
- Kochi University
- Kochi 780-8520, Japan
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103
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Manna MS, Mukherjee S. Remarkable influence of secondary catalyst site on enantioselective desymmetrization of cyclopentenedione. Chem Sci 2014. [DOI: 10.1039/c3sc53102c] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
An efficient, robust and highly enantioselective catalytic desymmetrization of 2,2-disubstituted cyclopentene-1,3-diones is developed via direct vinylogous nucleophilic addition of deconjugated butenolides.
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Affiliation(s)
- Madhu Sudan Manna
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560 012, India
| | - Santanu Mukherjee
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560 012, India
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104
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Wang HY, Zhang W, Schienebeck CM, Bennett SR, Tang W. Intermolecular bromoesterification of conjugated enynes: an efficient synthesis of bromoallenes. Org Chem Front 2014. [DOI: 10.1039/c3qo00088e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly functionalized bromoallenes were prepared by intermolecular 1,4-bromoesterification of conjugated enynes.
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Affiliation(s)
- Hao-Yuan Wang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
| | - Wei Zhang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
| | | | | | - Weiping Tang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
- Department of Chemistry
- University of Wisconsin
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105
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Murai K, Shimizu N, Fujioka H. Enantioselective iodolactonization of allenoic acids. Chem Commun (Camb) 2014; 50:12530-3. [DOI: 10.1039/c4cc05414h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
An enantioselective iodolactonization reaction of allenoic acids has been developed using a trisimidazoline catalyst and I2.
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Affiliation(s)
- Kenichi Murai
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Suita, Japan
| | - Nozomi Shimizu
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Suita, Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Suita, Japan
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106
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Roux C, Candy M, Pons JM, Chuzel O, Bressy C. Stereocontrol of all-carbon quaternary centers through enantioselective desymmetrization of meso primary diols by organocatalyzed acyl transfer. Angew Chem Int Ed Engl 2013; 53:766-70. [PMID: 24311470 DOI: 10.1002/anie.201308268] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 10/25/2013] [Indexed: 11/08/2022]
Abstract
The symmetry breaking of meso primary diols bearing a tetrahydropyran ring was employed, using catalytic asymmetric acyl transfer, to control all-carbon quaternary stereocenters. The planar chiral Fu DMAP catalyst was used in this reaction to reach a high degree of enantioselectivity (up to 97:3 e.r.) through a synergic effect combining a desymmetrization step and a kinetic resolution. Moreover, a beneficial effect was exhibited by C6F6 solvent, yielding the first example of an organocatalyzed asymmetric acyl transfer. The desymmetrized monoesters were then used to obtain, after a straightforward ring opening sequence, complex polyketide building blocks bearing all-carbon quaternary stereocenters.
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Affiliation(s)
- Christèle Roux
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 Marseille (France) http://ism2.univ-amu.fr/
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107
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Roux C, Candy M, Pons JM, Chuzel O, Bressy C. Stereocontrol of All-Carbon Quaternary Centers through Enantioselective Desymmetrization ofMesoPrimary Diols by Organocatalyzed Acyl Transfer. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201308268] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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108
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Armstrong A, Braddock DC, Jones AX, Clark S. Catalytic asymmetric bromolactonization reactions using (DHQD)2PHAL-benzoic acid combinations. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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109
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Cai Q, Yin Q, You SL. Chiral-Amine-Catalyzed Asymmetric Bromocyclization of Tryptamine Derivatives. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300146] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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110
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Yousefi R, Ashtekar KD, Whitehead DC, Jackson JE, Borhan B. Dissecting the stereocontrol elements of a catalytic asymmetric chlorolactonization: syn addition obviates bridging chloronium. J Am Chem Soc 2013; 135:14524-7. [PMID: 24025085 DOI: 10.1021/ja4072145] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We report absolute and relative stereochemistry of addition in enantioselective chlorolactonizations of 4-phenyl-4-pentenoic acid and its related t-butyl ester, catalyzed by (DHQD)2PHAL. Predominant syn addition of the chlorenium and the nucleophile across the olefin is observed. As shown by isotopic labeling, NMR spectroscopy, and derivative studies, the two new stereocenters formed by addition across the double bond are set independently and influenced by different factors. These findings suggest a stepwise process via an intermediate capable of lactone closure with either stereochemistry, in contradistinction to the more familiar scenario in which anti addition is dictated by a bridging chloronium ion intermediate.
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Affiliation(s)
- Roozbeh Yousefi
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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111
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Jaganathan A, Staples RJ, Borhan B. Kinetic resolution of unsaturated amides in a chlorocyclization reaction: concomitant enantiomer differentiation and face selective alkene chlorination by a single catalyst. J Am Chem Soc 2013; 135:14806-13. [PMID: 24000816 DOI: 10.1021/ja407241d] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The first example of a kinetic resolution via chlorofunctionalization of olefins is reported. The enantiomers of racemic unsaturated amides were found to have different hydrogen-bonding affinities for chiral Lewis bases in numerous solvents. This interaction was exploited in developing a kinetic resolution of racemic unsaturated amides via halocyclization. The same catalyst serves to both "sense chirality" in the substrate as well as mediate a highly face-selective chlorine delivery onto the olefin functionality, resulting in stereotriad products in up to 99:1 dr and up to 98.5:1.5 er. The selectivity factors were typically greater than 50 to allow for the simultaneous synthesis of both the products and unreacted substrates in highly enantioenriched form at yields approaching 50%. The reaction employs catalytic amounts (≤0.50 mol %) of a commercially available and recyclable organocatalyst.
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Affiliation(s)
- Arvind Jaganathan
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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112
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Hu DX, Shibuya GM, Burns NZ. Catalytic enantioselective dibromination of allylic alcohols. J Am Chem Soc 2013; 135:12960-3. [PMID: 23952929 DOI: 10.1021/ja4083182] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new dibromination reaction involving the combination of dibromomalonate as the bromonium source and a titanium bromide species as the bromide source has been developed. Enantioselective catalysis has been achieved through apparent ligand acceleration by a tartaric acid-derived diol.
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Affiliation(s)
- Dennis X Hu
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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113
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Yin Q, You SL. Enantioselective Chlorocyclization of Indole Derived Benzamides for the Synthesis of Spiro-indolines. Org Lett 2013; 15:4266-9. [DOI: 10.1021/ol4020943] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qin Yin
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Shu-Li You
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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114
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Zhou F, Tan C, Tang J, Zhang YY, Gao WM, Wu HH, Yu YH, Zhou J. Asymmetric copper(I)-catalyzed azide-alkyne cycloaddition to quaternary oxindoles. J Am Chem Soc 2013; 135:10994-7. [PMID: 23855917 DOI: 10.1021/ja4066656] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We report a highly enantioselective Cu(I)-catalyzed azide-alkyne cycloaddition via asymmetric desymmetrization of oxindole-based 1,6-heptadiynes, which furnishes quaternary oxindoles bearing a 1,2,3-triazole-containing moiety with 84-98% ee.
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Affiliation(s)
- Feng Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
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115
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Sawamura Y, Nakatsuji H, Sakakura A, Ishihara K. “Phosphite–urea” cooperative high-turnover catalysts for the highly selective bromocyclization of homogeranylarenes. Chem Sci 2013. [DOI: 10.1039/c3sc51432c] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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